ECMlink Cruise/Idle lean - log attached

[koryto2012]

I'm running very lean and I can't seem to figure out why/get it tuned in. I just need to know how to either add fuel or decrease air. Any help is appreciated.

 

[miliman13]

Hey wish I could solve your problem in one sentence or less but its not that easy. However I did a good job of taking pics when learning to use link. Try this link see if it helps best of luck.
http://www.dsmtuners.com/threads/attempting-to-understand-ecmlink.474802/

 

[snowborder714]

Are you actually capturing your wideband? I don't see it in the log, but see it noted in the ECU Inputs tab. Make sure this value is captured/displayed. This should also add WBFactor, but if it doesn't, make sure to add it as well.

Your idle is off. I see your AirflowPerRatio is in check, so that means at idle your MAF Comp sliders are good. But your CombinedFT is way out (+16%), which means you have to adjust your deadtime. You specifically need to raise it since your CombinedFT is positive. This will help get your idle dialed in.

For cruise, look at the MAF Comp sliders and pick the Hz points above 50Hz (that's the one you'll adjust for idle) and try to cruise with MAFRaw at those specific values. Then look at WBFactor and adjust your MAF Comp sliders based on that. For example, if WBFactor is 3% at 150Hz, then raise the 150Hz slider by 3%.

Make sure you've read through this link and checked off every item. A lot of the items in this list can throw off your tune if not verified.
http://www.dsmtuners.com/threads/please-read-before-you-ask-for-ecmlink-dsmlink-log-advice.443297/

Post up a new log once you have gone through and made some adjustments based off the reading.

 

[koryto2012]

Thanks guys I will give this a try tomorrow and report back.

 

[koryto2012]

So you're saying the MAFcomp sliders are going to be very negative? The way my a/f ratios are?

 

[snowborder714]

For idle, you shouldn't have to adjust your MAF Comp sliders.

For cruise, I don't know since I can't see your wideband in the log you posted.

 

[koryto2012]

I was able to get my wideband logged today, just I do believe it's f***ed up. I seen the connections for the o2 to the wideband and they were melted. Must have been riding on the exhaust. Looks like im going have to get a new sensor and cable.

 

[curt-s]

Also be aware of ground potentials for when you log your wideband. Many times, depending on where you have the grounds, what they're attached to, and the length of wire between the wideband module (not sensor) and the ECU, you could end up with a different voltage drop -- which will equate to a different reading in ECMlink than you get from the gauge itself. You might have to adjust your wideband voltage switch point in either ECMlink value settings or the gauge (if possible). This will assist in picking the perfect 14.7 so that the two align. Otherwise you'll be chasing an incorrect value.

Of course, what we're talking about is usually .1 to .2 AFR differences, nothing that important.. but at the very least, you now know and won't scratch your head when you see differing values

 

[lil corb]

Also be aware of ground potentials for when you log your wideband. Many times, depending on where you have the grounds, what they're attached to, and the length of wire between the wideband module (not sensor) and the ECU, you could end up with a different voltage drop -- which will equate to a different reading in ECMlink than you get from the gauge itself. You might have to adjust your wideband voltage switch point in either ECMlink value settings or the gauge (if possible). This will assist in picking the perfect 14.7 so that the two align. Otherwise you'll be chasing an incorrect value.

Of course, what we're talking about is usually .1 to .2 AFR differences, nothing that important.. but at the very least, you now know and won't scratch your head when you see differing values

That's what I'm going through right now. It's .2 off from link. What switch point voltage should I try? It's a mtxl

 

[curt-s]

You'll have to determine that by measuing ground voltage offset.

From the MTX-L manual:

The analog outputs on the MTX-L are ‘single ended’. That is, each output uses just one wire. It is assumed that the MTX-L and the device it is being connected to are already sharing the same ‘ground’. In a vehicle, this is generally true, but there can be small of fsets in voltage when devices are grounded to, say, the chassis at different points. You can minimize these offsets by sharing a good, common ground point, or you can adjust for them by configuring the analog output voltages on the MTX-L.

You might want to try using one of the ECU ground points to tap to for the gauge via a longer wire and a good quality solder connection. Do not use the sensors ground wire. Otherwise, you must measure with a good quality meter and offset appropriately. I've been getting the notion that the MTX-L is very prone to voltage offsets.

Essentially if the guage reads 14.7 and ECMlink says 14.9, you'll have to increase the voltage switch point by some amount of millivolts; otherwise, if ECMlink reads lower, you'll have to drop. I think I have that right -- verify with the manual about AFR to voltage mappings beforehand.

It may not be precisely linearly scaled, however, and it might offset the further you get from the switch point.
You may have to go into the LM programmer for that part, if it even supports it. I've never even toyed with that and I haven't a clue where I hid the cable end in the dash